MATLAB Answers

emhol241
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Interpolating latitudes and longitudes

Asked by emhol241
on 28 Oct 2018
Latest activity Edited by jonas
on 28 Oct 2018
I have a set of latitudes and longitudes (both 506 x 270) sampled at 5km resolution and need it in 1km resolution (size 2030 x 1354). How do I interpolate between points to do this?

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1 Answer

Answer by jonas
on 28 Oct 2018
Edited by jonas
on 28 Oct 2018

lat and lon are your 5-km-resolution arrays and v (506x270) is the variable you want to interpolate.
% create finer grid
[latq lonq] = meshgrid(min(lat(:)):1:max(lat(:)),min(lon(:)):1:max(lon(:)))
% interpolate
vq = griddata(lat,lon,v,latq,lonq)

  2 Comments

I am confused as to what I use as v... I need to interpolate lat and long themselves?
I have a variable which is already 2030x1354 (i.e. 5 times the size of lat and long) and cannot do the data analysis I want until I have the coordinates in the same size as the variable
jonas
on 28 Oct 2018
Oh.. then just use meshgrid to build your grid without interpolating. Just skip the second part. I just assumed that your 5 km grid resolution had some meaning because you mentioned it, as well as interpolation, in the question... Creating a grid has nothing to do with either.

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